Biomass Boiler - Froling



NerG’s heritage is in biomass. We have been installing biomass boilers since 2013, so we understand the technical requirements of designing, installing and servicing of biomass heating systems.  We have installed boilers of all sizes, from 15kW to in excess of 1MW and have worked with many clients to improve their energy efficiency through biomass. All of our engineers are professionally trained and are experienced in installing many makes and models biomass boiler, you are in expert hands if you choose us. 


  • We have designed systems from domestic boilers right through to 6MW industrial plants

  • Our engineers can design new installations from scratch, integration of new plants to existing systems or re-design systems where there are problems


  • We have installed hundreds of biomass systems

  • From single dwelling domestic boilers to commercial boilers, we’ve done them all!



Belton House Project

NerG began work recently installing a new biomass facility and pipe work into Belton House, a lovely National Trust property located in Grantham. The new biomass boiler system will provide renewable heating to 16 historic buildings onsite.

To read more about the project and it’s progress, please click here


Biomass Installs


Drawing © Hartland Design & Justsen


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- Wood chip is approximately half the cost of oil
- Biomass boilers attract Enhanced Capital Allowances
Energy Security
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Energy Security
- Biomass fuels provide a secondary source of energy over traditional fuels
- They offer an alternative to price volatile carbon fuels
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- Biomass boilers can dramatically reduce your carbon emissions
- Biomass produces approximately 15-20mg of carbon per kW of heat
- By comparison oil produces over 180mg/kW
Government Funding
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Government Funding
- Biomass boilers attract government funding in the form of the Renewable Heat Incentive (RHI)
- This incentivises energy users to invest in a biomass system by offering 20 years of index linked payments
- Payments are linked to annual heat use, so the larger the use the better the RHI


NerG’s preferred biomass boilers to install are Froling, ETA and Jutsen, the reasons for which can be seen below. However, if you would like us to fit a different biomass boiler, we would be more than happy to do so as we have experience in installing a wide range of manufacturers.

Froling Boiler


Froling, based in Austria, have been building biomass boilers since the 1960’s. They have built up a wealth of knowledge of burning and the effects on materials, which has enabled them to produce very reliable boilers. Froling insists that any installing company is properly trained. All of our installation engineers have been to their training centre at their factory in Austria.

Froling manufacture all components of their boilers themselves and are passionate about their products. If NerG needs any technical support then we can guarantee that their technical team will be able to solve the problem. Froling also stocks a large amount of parts, which can often be delivered next day.
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ETA biomass boiler


Made in Austria near Grieskirchen, ETA was originally set up in 1998 and make a range of wood pellet, log and wood chip boilers. NerG have visited their factory, which is assembly only. Major fabrications for ETA are made by local companies. The ETA boilers started small, aiming at the domestic market, and have over the years developed large boilers for the commercial market.

With UK distribution supplied by Innasol, NerG have a direct support and spare parts channel, which are able to deliver most parts next day. The worst case we have experienced was a 3 day delay, which was for a complete conveyor system to replace one that had been damaged. Our experience of ETA and their technical support has generally been very good and their support of professional companies, like NerG, is one of the reasons why we choose ETA as a preferred boiler.
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Changes in the funding of renewables and encouragement to reduce use of carbon based fossil fuels means that heating systems are increasing is size.  NerG have installed many systems in excess of 1MW in capacity.  Moving to larger systems requires a different approach on boilers.  The technology to produce 250 Kilowatts is very different to producing 6 Megawatts.

We looked for a supplier with

  • a long track record in producing boilers in this range
  • experience of handling large fuel quantities
  • experience of combustion of alternative fuels – not just woodchip.
  • a technical team that are available, knowledgeable and understandable.

The investment in large heating systems is considerable and requires a high level of trust and a proven track record both in the installer and in the equipment supplier.  Justsen are a Danish family owned business.  There whole business is conducted in English, all the drawings are in English and we are dealing directly not just with managers, but also the owners of the company.
They have a huge experience in the manufacture of biomass boilers which are used all around the world, but their growth came from the heating networks that are installed in hundreds of Danish villages.
We are very proud to work with such a knowledgeable and professional company.  It is a pleasure to offer customers the opportunity to visit both their factory and a number of their installs in Denmark.

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Biomass is any organic material that comes from plants and animals. Biomass is a renewable source of energy and when burned, the energy contained within it is released as heat. This heat can then be used to heat buildings, used in industrial processes or can be used to generate electricity. Typical biomass fuels can include wood chip, wood pellets, straw & food by-products, though others fuels like waste products, can be used also.

Lambdamat Biomass Boiler
  • 1) Woodchip is fed into a combustion chamber where it is ignited at a temperature of 600°C to release gases.

  • 2) The hot gases are then re-burned which generates temperatures of 1200°C

  • 3) The hot air and gases then pass through a heat exchanger which transfers the heat to the water, which can be used for central heating.

  • 4) Excess heat is stored in a thermal tank called a buffer tank.


Glen Farrow

Manufactured near Boston, Glen Farrow have a significant market presence in the large manually loaded batch boilers.  Their control systems are relatively simple and there’s not much to go wrong.  Fuel quality has a significant impact on the smoke from the flue.  We service a number of these boilers (mainly on farms). 

In a number of cases, to improve fuel efficiency and increase boiler temperature (therefore reducing smoke), we have fitted buffer vessels and water temperature control valves alongside the boilers.  The effect of this has been to allow the burner to run at full power (and therefore reduced smoke) for longer periods, before it runs out of fuel or needs to reduce output.  We have seen reductions in fuel usage of as much as 50% when we have done this.

We can’t rate the quality of the technical support as we have not yet needed it, however parts ordered from Glen Farrow have arrived quickly when we have ordered them.


Uniconfort are a large Italian manufacturer of boiler systems . They specialise in large boilers 500KW – multiple MW.  They were represented by Eco Link who ceased trading in 2014/5.  The sales and support is now provided through a small UK based subsidiary of the parent company.  In our opinion, the boilers are great, but the support is pretty difficult, although we do have access to the Italian engineers, who are very helpful.  Parts supply is currently very difficult, and can take nearly 2 weeks to get a price.

We do however successfully look after a number of Uniconfort boilers.  We know our way around the control systems and can buy most parts from other sources.  A bearing can be bought from anywhere, and many of the actuators and sensors are used on other boilers, which we support. On occasions we’ve also manufactured our own parts as replacements.


Binder boilers concentrate at the largest end of the bought in boiler systems.  They produce a range of hot water and steam boilers  from 15kw up to 10MW.  NerG support and service customers with these well built and well supported boilers.  We work with the UK importer when tech support is required, but the supply of spares and availability of detailed technical support and manuals/parts books has been very good.  We look after a number of large heating and process systems using boilers of this size and so are well used to supplying the knowledge and manpower to keep these systems running.


Arikazan make a great simple pellet boiler and feed systems for them.  Very simple in construction, fortunately there is little to go wrong, as the UK support for them is no longer trading.  The Turkish manufacturers however are very helpful.  Most of the common components are used by other manufacturers and so sourcing hasn’t been difficult.  We look after a number of Arikazan boilers and so find supporting them relatively simple.


A very simple, batch type boiler that is suited to burning large logs and pallet wood, though restrictions are placed on what can be burnt for RHI purposes.  The boiler is manufactured near Boston by a very small company of engineers.  They are simple but effective.  Unfortunately getting spares has been slow, there appears to be only one man who can give you a price and he’s often not there.  However, in that we look after a few of these boilers, we now know what is required and where the parts can be sourced from.  We have had problems with a few of the fire brick doors, new are prohibitively expensive, so we have re-cast our own in the original steel frames.  The boilers are simple enough that we don’t really need technical support.


Gilles boilers are manufactured in Austria and have a good and strong heritage in biomass boiler systems.

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